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New Mexico State University (2016)

Assessing the potential effects of tebuthiuron on shrub encroached scaled quail habitat using a dynamic systems approach

East, Nathan Forrest

Titre : Assessing the potential effects of tebuthiuron on shrub encroached scaled quail habitat using a dynamic systems approach

Auteur : East, Nathan Forrest

Université de soutenance : New Mexico State University

Grade : Master of Science (MS) 2016

Notes
Shrub encroachment by creosotebush (Larrea tridentata ; LATR) in desert black grama (Bourteloua eriopoda ; BOER) grasslands is suspected of negatively effecting scaled quail (Callipepla squamata) habitat and populations. To better understand the possible effects of habitat restoration on scaled quail in shrub encroached habitat, I used a dynamic systems modeling approach to quantify and assess the use of the herbicide tebuthiuron (TEB) under the limitations of current knowledge. I did this in accordance with the objective of the Conversation Effects Assessment Project (CEAP). A dynamic systems model allows for scenario analysis given current system understanding and knowledge. My model showed that BOER and LATR will reach equilibrium in the presence of each other after approximately 100 years given a stochastic but stable precipitation regime and a constant rate of herbivory. Sensitivity analysis showed that LATR recovery from TEB treatment takes approximately 100 years based on chemical persistence of TEB in the soil. The model suggests that the time before LATR resurgence can be increased by reduced herbivory, increased precipitation, or lower precipitation stochasticity. The model suggests that TEB application modifies shrub-encroached landscape to a closer approximation of scaled quail habitat, as referenced by New Mexico Game and Fish guidelines, for a period of approximately 150 years, given average annual rainfall, moderate grazing, and the persistence of TEB. This approach provides a means of quantifying vegetation change in relation to species habitat by averaging the differences between the modeled plant species output and the benchmark of recommended levels for a single wildlife species habitat

Présentation (NMSU Library)

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